Unnamed Prospects, Collins Hill, Portland, Middlesex County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| Unnamed Prospects | - not defined - |
| Collins Hill | Hill |
| Portland | - not defined - |
| Middlesex County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° North , 72° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~1km
Köppen climate type:
Mindat Locality ID:
289406
Long-form identifier:
mindat:1:2:289406:8
GUID (UUID V4):
a45ef779-8099-453c-a47c-4955948f9c4f
Two small quarry openings on the South end of Collins Hill. These prospects were confused with the Hale-Walker prospects based on inaccuracies in dates and their correlation with aerial photos until 2016. Rowan Lytle and Harold Moritz differentiated the two localities based on Stugard's 1958 study of pegmatites and 1934 aerial photos.
The most distinguishing factor of this pegmatite is the mineralogy. It stands out from other pegmatites in the Collins Hill formation in that there is no schorl whatsoever anywhere in it. Beryl crystals from the core margins of the south eastern prospect were found both in place and in tailings approaching 40cm in length. Blocky masses of pale green and yellowish beryl as much as 25 cm across are common, though they are objectively ugly and would be of little interest to collectors. Smaller beryls from this locality, collected in a period between 2008 and 2013 actually approach the color of some aquamarines from the nearby Pelton's Quarry. Lack of large books of muscovite in the pegmatite suggests that perthite or beryl were likely the minerals this quarry was worked for.
These prospects are located on private, residential property. Do not visit without permission from the land owner.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Albite Formula: Na(AlSi3O8) |
| ⓘ Almandine Formula: Fe2+3Al2(SiO4)3 Description: Well formed crystals occur in books of muscovite. |
| ✪ Beryl Formula: Be3Al2(Si6O18) Habit: Prismatic and masses of parallel growth crystals. Colour: blue, light green, yellow, white Description: Some elongated prisms of light blue aquamarine were found in the late 2000's and early 2010's, ranging from 10 to 30cm. Some small gemmy haliodors were found towards the end of the same time period, slightly etched and with pinacoidal terminations. References: |
| ⓘ Beryl var. Aquamarine Formula: Be3Al2Si6O18 References: |
| ⓘ Beryl var. Heliodor Formula: Be3Al2(Si6O18) References: |
| ⓘ Fluorapatite Formula: Ca5(PO4)3F Colour: Dark green Fluorescence: Short Wave UV (yellow fluorescence) |
| ⓘ Microcline Formula: K(AlSi3O8) |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 References: |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 References: |
| ⓘ Quartz var. Smoky Quartz Formula: SiO2 References: |
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Smoky Quartz | 4.DA.05 | SiO2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| Group 9 - Silicates | |||
| ⓘ | Almandine | 9.AD.25 | Fe2+3Al2(SiO4)3 |
| ⓘ | Beryl var. Aquamarine | 9.CJ.05 | Be3Al2Si6O18 |
| ⓘ | 9.CJ.05 | Be3Al2(Si6O18) | |
| ⓘ | var. Heliodor | 9.CJ.05 | Be3Al2(Si6O18) |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Be | Beryllium | |
| Be | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| Be | ⓘ Beryl | Be3Al2(Si6O18) |
| Be | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| O | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| O | ⓘ Beryl | Be3Al2(Si6O18) |
| O | ⓘ Fluorapatite | Ca5(PO4)3F |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Quartz var. Smoky Quartz | SiO2 |
| O | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| F | Fluorine | |
| F | ⓘ Fluorapatite | Ca5(PO4)3F |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| Al | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| Al | ⓘ Beryl | Be3Al2(Si6O18) |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Beryl var. Aquamarine | Be3Al2Si6O18 |
| Si | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| Si | ⓘ Beryl | Be3Al2(Si6O18) |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Quartz var. Smoky Quartz | SiO2 |
| Si | ⓘ Beryl var. Heliodor | Be3Al2(Si6O18) |
| P | Phosphorus | |
| P | ⓘ Fluorapatite | Ca5(PO4)3F |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| K | Potassium | |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Fluorapatite | Ca5(PO4)3F |
| Fe | Iron | |
| Fe | ⓘ Almandine | Fe32+Al2(SiO4)3 |
| Fe | ⓘ Pyrite | FeS2 |
Mindat Articles
Not Really Hale Walker... by Rowan LytleOther Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Ganderia DomainDomain
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References
